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Porirua CityPopulation forecast

Porirua City

Population and age structure

Between 2016 and 2028, the age structure forecasts for Porirua City indicate a 21.0% increase in population under working age, a 56.3% increase in population of retirement age, and a 21.5% increase in population of working age.

Knowledge of how the age structure of the population is changing is essential for planning age-based facilities and services, such as child care, recreation and aged care.

The forecast age groups of Porirua City is a function of the current age of the population (people aging each year, being born and dying) as well as the age of people migrating into and out of the area. This in turn is driven by location (fringe, city centre, regional or rural) the existing housing stock (separate dwellings, medium or high density), the amount and type of new residential development (same as existing stock, or diversifying) and where the area is in a cycle of change. We call this the area’s residential role and function. You can learn more about this in the section household and suburb life cycles.

Forecast age structure - 5 year age groups
Porirua City - Total persons201620282048Change between 2016 and 2048
Age group (years)Number%Number%Number%Number
0 to 44,3778.05,3707.86,6057.5+2,227
5 to 94,5598.35,2547.76,5287.4+1,969
10 to 144,0547.45,0987.46,3747.3+2,320
15 to 193,9597.24,8407.15,9296.8+1,969
20 to 243,4606.33,9895.84,9205.6+1,460
25 to 293,1055.73,7425.54,3234.9+1,218
30 to 343,1365.74,1966.14,7295.4+1,593
35 to 393,6936.74,7426.95,5026.3+1,809
40 to 444,0637.44,8967.15,9966.8+1,934
45 to 494,0847.54,6226.76,0836.9+1,999
50 to 543,7146.84,3296.35,8336.7+2,119
55 to 593,3856.24,1126.05,4486.2+2,063
60 to 642,8515.23,6045.24,8535.5+2,001
65 to 692,4544.53,1814.64,2134.8+1,759
70 to 741,7143.12,5953.83,6874.2+1,972
75 to 791,1342.12,0553.03,1553.6+2,021
80 to 845531.01,2231.82,0752.4+1,522
85 and over4520.88051.21,3741.6+922
Total persons54,748100.068,651100.087,627100.0+32,879
Population and household forecasts, 2013 to 2048, prepared by .id , the population experts, November 2019.

Key findings

In 2016, the dominant age structure for persons in Porirua City was ages 5 to 9, which accounted for 8.3% of the total persons.

The largest increase in persons between 2016 and 2028 is forecast to be in ages 30 to 34, which is expected to increase by 1,060 and account for 6.1% of the total persons.

The largest 5 year age group in 2028 is 0 to 4 years, with a total of 5,370 persons.

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